package com.liwc.controller;

import java.awt.image.BufferedImage;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;

/**
 * kaptcha生成验证码
 * 标题：基于RBAC的基础权限框架demo
 * 功能：
 * 描述：
 * @author liwc
 * @date 2018年6月19日 下午4:07:53
 * @ KaptchaController
 */
@Controller
@RequestMapping("kaptcha")
public class KaptchaController {
	
	@Autowired
	private Producer captchaProducer;


	@RequestMapping("/captcha-image")
	public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
		response.setDateHeader("Expires", 0);
		response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
		response.addHeader("Cache-Control", "post-check=0, pre-check=0");
		response.setHeader("Pragma", "no-cache");
		response.setContentType("image/jpeg");

		String capText = captchaProducer.createText();
		request.getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);
		BufferedImage bi = captchaProducer.createImage(capText);
		ServletOutputStream out = response.getOutputStream();
		ImageIO.write(bi, "jpg", out);
		try {
			out.flush();
		} finally {
			out.close();
		}
		return null;
	}
}